[U-Boot] [PATCH 03/13] mailbox: zynqmp: ipi mailbox driver
Michal Simek
michal.simek at xilinx.com
Fri Sep 27 13:34:54 UTC 2019
From: Ibai Erkiaga <ibai.erkiaga-elorza at xilinx.com>
ZynqMP mailbox driver implementing IPI communication with PMU. This would
allow U-Boot SPL to communicate with PMUFW to request privileged
operations.
Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza at xilinx.com>
Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---
MAINTAINERS | 1 +
arch/arm/mach-zynqmp/include/mach/sys_proto.h | 5 +
drivers/mailbox/Kconfig | 6 +
drivers/mailbox/Makefile | 1 +
drivers/mailbox/zynqmp-ipi.c | 134 ++++++++++++++++++
5 files changed, 147 insertions(+)
create mode 100644 drivers/mailbox/zynqmp-ipi.c
diff --git a/MAINTAINERS b/MAINTAINERS
index f448c5f19e00..f5feb89ac3e9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -448,6 +448,7 @@ F: drivers/gpio/zynq_gpio.c
F: drivers/i2c/i2c-cdns.c
F: drivers/i2c/muxes/pca954x.c
F: drivers/i2c/zynq_i2c.c
+F: drivers/mailbox/zynqmp-ipi.c
F: drivers/mmc/zynq_sdhci.c
F: drivers/mtd/nand/raw/zynq_nand.c
F: drivers/net/phy/xilinx_phy.c
diff --git a/arch/arm/mach-zynqmp/include/mach/sys_proto.h b/arch/arm/mach-zynqmp/include/mach/sys_proto.h
index 915badc6fbee..f25d414dcb1e 100644
--- a/arch/arm/mach-zynqmp/include/mach/sys_proto.h
+++ b/arch/arm/mach-zynqmp/include/mach/sys_proto.h
@@ -54,6 +54,11 @@ enum {
TCM_SPLIT,
};
+struct zynqmp_ipi_msg {
+ size_t len;
+ u32 *buf;
+};
+
int zynq_board_read_rom_ethaddr(unsigned char *ethaddr);
unsigned int zynqmp_get_silicon_version(void);
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 11bf5522db53..85c2a829aed8 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -41,4 +41,10 @@ config K3_SEC_PROXY
Select this driver if your platform has support for this hardware
block.
+config ZYNQMP_IPI
+ bool "Xilinx ZynqMP IPI controller support"
+ depends on DM_MAILBOX && ARCH_ZYNQMP
+ help
+ This enables support for the Xilinx ZynqMP Inter Processor Interrupt
+ communication controller.
endmenu
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index a753cc4e6806..d2ace8cd212e 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_SANDBOX_MBOX) += sandbox-mbox-test.o
obj-$(CONFIG_STM32_IPCC) += stm32-ipcc.o
obj-$(CONFIG_TEGRA_HSP) += tegra-hsp.o
obj-$(CONFIG_K3_SEC_PROXY) += k3-sec-proxy.o
+obj-$(CONFIG_ZYNQMP_IPI) += zynqmp-ipi.o
diff --git a/drivers/mailbox/zynqmp-ipi.c b/drivers/mailbox/zynqmp-ipi.c
new file mode 100644
index 000000000000..c181a7b81768
--- /dev/null
+++ b/drivers/mailbox/zynqmp-ipi.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Xilinx Zynq MPSoC Mailbox driver
+ *
+ * Copyright (C) 2018-2019 Xilinx, Inc.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <mailbox-uclass.h>
+#include <mach/sys_proto.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <wait_bit.h>
+
+/* IPI bitmasks, register base */
+/* TODO: move reg base to DT */
+#define IPI_BIT_MASK_PMU0 0x10000
+#define IPI_INT_REG_BASE_APU 0xFF300000
+
+struct ipi_int_regs {
+ u32 trig; /* 0x0 */
+ u32 obs; /* 0x4 */
+ u32 ist; /* 0x8 */
+ u32 imr; /* 0xC */
+ u32 ier; /* 0x10 */
+ u32 idr; /* 0x14 */
+};
+
+#define ipi_int_apu ((struct ipi_int_regs *)IPI_INT_REG_BASE_APU)
+
+struct zynqmp_ipi {
+ void __iomem *local_req_regs;
+ void __iomem *local_res_regs;
+ void __iomem *remote_req_regs;
+ void __iomem *remote_res_regs;
+};
+
+static int zynqmp_ipi_send(struct mbox_chan *chan, const void *data)
+{
+ const struct zynqmp_ipi_msg *msg = (struct zynqmp_ipi_msg *)data;
+ struct zynqmp_ipi *zynqmp = dev_get_priv(chan->dev);
+ u32 ret;
+ u32 *mbx = (u32 *)zynqmp->local_req_regs;
+
+ for (size_t i = 0; i < msg->len; i++)
+ writel(msg->buf[i], &mbx[i]);
+
+ /* Write trigger interrupt */
+ writel(IPI_BIT_MASK_PMU0, &ipi_int_apu->trig);
+
+ /* Wait until observation bit is cleared */
+ ret = wait_for_bit_le32(&ipi_int_apu->obs, IPI_BIT_MASK_PMU0, false,
+ 100, false);
+
+ debug("%s, send %ld bytes\n", __func__, msg->len);
+ return ret;
+};
+
+static int zynqmp_ipi_recv(struct mbox_chan *chan, void *data)
+{
+ struct zynqmp_ipi_msg *msg = (struct zynqmp_ipi_msg *)data;
+ struct zynqmp_ipi *zynqmp = dev_get_priv(chan->dev);
+ u32 *mbx = (u32 *)zynqmp->local_res_regs;
+
+ for (size_t i = 0; i < msg->len; i++)
+ msg->buf[i] = readl(&mbx[i]);
+
+ debug("%s, recv %ld bytes\n", __func__, msg->len);
+ return 0;
+};
+
+static int zynqmp_ipi_probe(struct udevice *dev)
+{
+ struct zynqmp_ipi *zynqmp = dev_get_priv(dev);
+ struct resource res;
+ ofnode node;
+
+ debug("%s(dev=%p)\n", __func__, dev);
+
+ /* Get subnode where the regs are defined */
+ /* Note IPI mailbox node needs to be the first one in DT */
+ node = ofnode_first_subnode(dev_ofnode(dev));
+
+ if (ofnode_read_resource_byname(node, "local_request_region", &res)) {
+ dev_err(dev, "No reg property for local_request_region\n");
+ return -EINVAL;
+ };
+ zynqmp->local_req_regs = devm_ioremap(dev, res.start,
+ (res.start - res.end));
+
+ if (ofnode_read_resource_byname(node, "local_response_region", &res)) {
+ dev_err(dev, "No reg property for local_response_region\n");
+ return -EINVAL;
+ };
+ zynqmp->local_res_regs = devm_ioremap(dev, res.start,
+ (res.start - res.end));
+
+ if (ofnode_read_resource_byname(node, "remote_request_region", &res)) {
+ dev_err(dev, "No reg property for remote_request_region\n");
+ return -EINVAL;
+ };
+ zynqmp->remote_req_regs = devm_ioremap(dev, res.start,
+ (res.start - res.end));
+
+ if (ofnode_read_resource_byname(node, "remote_response_region", &res)) {
+ dev_err(dev, "No reg property for remote_response_region\n");
+ return -EINVAL;
+ };
+ zynqmp->remote_res_regs = devm_ioremap(dev, res.start,
+ (res.start - res.end));
+
+ return 0;
+};
+
+static const struct udevice_id zynqmp_ipi_ids[] = {
+ { .compatible = "xlnx,zynqmp-ipi-mailbox" },
+ { }
+};
+
+struct mbox_ops zynqmp_ipi_mbox_ops = {
+ .send = zynqmp_ipi_send,
+ .recv = zynqmp_ipi_recv,
+};
+
+U_BOOT_DRIVER(zynqmp_ipi) = {
+ .name = "zynqmp-ipi",
+ .id = UCLASS_MAILBOX,
+ .of_match = zynqmp_ipi_ids,
+ .probe = zynqmp_ipi_probe,
+ .priv_auto_alloc_size = sizeof(struct zynqmp_ipi),
+ .ops = &zynqmp_ipi_mbox_ops,
+};
--
2.17.1
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